Carbureter-controlling means.



W. PEMBROKE. CARBURETER CONTROLLING MEANS.

APPLICATION FILED JUNE 4, 19M- ]Patemed Dem. 112, 11916.

WINEIELD 1P. PEMEROKTE, Oh ROGHEEITEB, lllE'W 'EZ'Wltllll.

CARBURETER-CONTROLLIN MEANS.

Specification of Letters llatent.

Application filed June t, 1914. serial No. 843,074.

To all whom it may concern Be it known that I, VVINFIELD P. PEMBROKE, of Rochester, in the county of Monroe and State of New York have invented certain new and useful Improvements in Carbureter-Controlling Means; and I do hereby declare the following to be a full, clear and exact description of the same, reference be ing had to the accompanying drawings, forming a part of this specification, and to the reference numerals marked thereon.

My present invention relates to explosive engines and more particularly ,to .charge forming devices therefor and it has for its object to produce a carbureter of the type in which an induction valve is unseated to admit the charge or a component part thereof by atmospheric pressure, due to the suction of the engine cylinders, in which undue clattering of the valve because of the pulsations or rapid variations of internal pressure in the carburetor will be prevented.

A further object-of the invention is to provide positive means insuring the opening of the valve coincidently with and proportionately to the opening of the throttle,

should it fail to act properly under the influence of atmospheric pressure alone.

To these and other ends the invention consists of certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

in the drawings, Figure 1 is an elevation of a portion of a carbureter constructed in accordance with and illustrating one embodiment of my invention. Fig. 2 is a top plan view partially in horizontal section on the line 22 of Fig. 1., and Fig. 3 is a vertical centralsection taken substantially on the line 33 of Fig. 2.

Similar reference numerals in the several views indicate the same parts.

it have illustrated, in the present instance, only so much of thecarbureter as is neces sary to an understanding of that department thereof toward which my improvements are directed and while the invention is applicable to both simple carbureters having but one charge forming device for all speeds and compound carbureters having a plurality of such devices for different speeds it is shown embodied in one of the latter class wherein 1 and 2, respectively, indicate charge induction ports that may be chambers, and 3 the eduction port that is Patented Dec. 32, this.

joined up for communication with the engine cylinders. The usual vacuum chamber 4 lntervenes and communication between it and the eduction port 3 is controlled by the usual butter fly valve or throttle 5 mounted on a shaft 6 that may be rotated to open and close the valve by a lever 7 on an exteriorly projecting end.

The induction port 1 is normally held closed by a valve 8 cooperating with the seat 9. The valve has a stem 10 projecting enteriorly of the chamber 4: through a cover plate 11 and a spring 12 interposed between the latter and the valve 8 holds the valve against its seat. The general construction so far described is the usual one: When the throttle 5 is open the suction of the cylinder rarefies the air in the vacuum chamber l and the atmospheric pressure raises the valve 8 against the tension of the spring 12 and admits itself as a mixture of air and gas through the port 1 into the chamber a from whence it is drawn into the engine cylinders. The valve is opened to a greater or less degree according to the speed of the engine and the rapidity of the displacements made by the pistons.

With multiple cylinder engines, particularly, where the various cylinders are fed through a manifold from the same source of carburization, the cylinders do not all draw equally causing pulsations in the chamber 4 that lead the valve 8 to vibrate rapidly. This action is particularly evident While the engine is running at the higher speeds in which case the rapid gas exhausting move ments of the cylinders as they successively exert their influence in the chamber 4 fol low each other at such minute intervals that their individual demands upon the valve 8 are not promptly met. Thus, if one cylinder 7 is weaker in its exhausting effect than the one that follows its lesser influence on the valve 8 is perhaps not felt therein but in such other one and taking into consideration the inertia of the valve itself which can not practically be made sensitive beyond a certain degree, it is inevitable that indecisive vibrations or fluctuations of the valve will result. To prevent this action and insure a steady flow through the valve while the throttle is open in order that the cylinders may be uniformly fedup to the maximum amount required whereby the continued effir rig mechanism: dor ualed for rotation on the projecting end 10 the valve stem 10 is an annular cam 1% having oppositely disposed high points 14 and oppositel disposed low points and mounted on the said end 13 above the cam is a threaded nut 15 having pins or abutments 16 projectine" over the cam fromv opposite sides thereof which nut is thus adjustable on the stem and may be locked in place by a jam nut 1?. Normally, and when the valve 8 is closed, the abutments 16 rest in the lOW portions 15 of the cam in very slight spaced relationship therewith as clearly shown in Figs. 1 and 2. A cable 18 fastened to the periphery of the cam is similarly secured to a pulley 19 on the other projecting end of the throttle shaft 6. Hence, when the said shaft 6 is rotated to open the throttle 5, the cam 14; is also rotated through the connection 18 and the high portions 14 thereof gradually rise beneath the abutments 16. Of course, the valve 8 is, in the meanwhile, immediately acted upon by atmospheric pressure and opens coincidently and proportionately to the opening of the throttle 5 so that the abutments 16 with the stem 10 rise from this cause. The cam surface, however,

keeps immediately under them and sustains the valve in open position in spite of any fluctuations of pressure in the vacuum chamber 4 except as a result of a-very definite movement of the throttle in which latter case the position of the cam itself is affected. Chattering of the valve is therefore prevented and its movements, though still automatically controlled by pressure are rendered uniform and definite. A spring 20 is employed for returning the cam Has the throttle is closed and a turn buckle 21 or other suitable device may be interposed between the connected ends of the cable 18 for adjusting the movement of the cam to the movement of the throttle. The valve stem 10 is feathered in the casing cover 11 at 22 to prevent rotation of the abutments 16. If, for any reason, the valve should stick against displacement by the atmospheric pressure it will be seen that the cam will operate to positively open it to at least apto the opening of proximately the required degree according the throttle though it is intended that the valve shall ordinarily be free for actuation by atmospheric pressure alone, the cam simply following up its movements and serving as an actuator only in extreme instances, the prime function of the cam being that of a sustaining member preventing the valve from falling back when such movement is not called for.

I claim as my invention:

1. In a carburetor, the combination with a throttle, an induction valve adapted to be opened by atmospheric pressure when the throttle is opened and a spring tending to close the valve, of positive moans operated by the opening movement of the throttle for automatically locking the valve open in any position in which it ma y be left by the said atmospheric action.

2. In a carburetor, the combination with a throttle, an induction valve adapted to be opened by atmospheric pressure when the throttle is opened and a spring tending to close the valve, of a mechanical device,

adapted to positively open the valve in the event of its failure to open under atmospheric pressure, and to positively and automatically maintain it open against the tension of the spring in any position in which it may be left by the said atmospheric action, and operating connections between said means and the throttle.

3. In a carbureter, the combination with a throttle, an induction valve having a stem provided with an abutment and adapted to be opened by atmospheric pressure when the throttle is opened and a spring tending to close the valve, of a cam having operating connections with the throttle arranged to cooperate with the abutment on the valve stem to positively maintain the valve open in any position in Which it may be left by the said atmospheric action position and to insure its opening coincidcntly with the opening of the throttle.

WINFIELD r. PEMBROKE. 

